Plug for incandescent electric lamps.



W. 0. TREGONING.

PLUG FOR INGANDESGENT ELECTRIC LAMPS.

APPLICATION FILED MAY 13, 1912.

L,1Q5,605, Patented Jan.19, 1915.

INVEN'TOR h Walliam @Tmggazziwg BY MW 1 3' V a bottom view of F snaresrarities? WILLIAM c. *rnneoirrne, or cnnvnnann, onto, ASSIGNOR, BY MESNEnssrenrtanrs, fronnmaaarn n'LEcrRrc mauurncro'sme COMPANY, or cnroaeo,ILLINOIS, a.

'conrornrron or ILLINOIS.

PLUG FOR l'iNGAINIBIESGENT ELECTRIC LAMPS.

menace.

Application filed may 13, 1912.

T 0 all whom it may concern:

Be it known that I, VILLIAM C. Tensor:- iNe, citizen of the UnitedStates, residing at Cleveland, in the and State of Ohio, have inventedcertain new and useful Improvements in Plugs for incandescent ElectricLamps, of which the the strand untwisted.

engaged relations,

ig. 5, and Fig. 5,' 1s a sectional elevation of the porcelain or likebody or headof the plug with certain arts attached thereto ashereinafter ascribed. Fig. 6 is a sectional elevation of a modificationof the flexible connecting mechanism between the two non-conductingpartsof'the plug as hereinafter fully described.

,Many difi'erent makes'of plugs have been on the market from time totime and which may be divided into two typesaccording to theirconstruction, one of said types having the conducting cordor strandfixed therein so that when'the plug is turned toscrew it into its socketthe strand will turn with it and become twisted accordingly, and the thestrand so related other type having therein that the plug can be'screwed into the socket and the strand will not turn with it and hencenot become twisted.

Without discussing the acknowledged. ohjections to both forms or typesas heretofore made the present invention enters the art as it werebetween both, having the strand so connected that it will receive apartial twist when screwing up but also such that it willuntwistaut'omatically as the part grasped by the hand is mo- Inentarilyreleased to take a new-grip, and this'action will continue and wind andunof the plug occurs wind the strand as often as the hand is changeduntil at last when turning of the county of Guyahoga Fig. 3 is anenlarged central sectional elevation of the plug in dis-.

as in Fig. 1. Fig. 4 is Specification of Lette'rsPatent.

Patented Jan. T19, i915; Serial no. ceases.

plug ceases the' strand will resume its straight or natural condition asthe locking engagement of the parts is relaxed.

Now, observing the tural aspects, we have the non-conducting body orhead 6, upon which the other A arts are directly or indirectly mounted,an the said body has a metallic band 2 about its reduced portion whichhas one or more recesses 3 struck in its side adapted to make rotaryinterlockingengagement with lugs/istruck on the inside of the screwshell 5 when said band is pressed upward for this purpose and to rotatethe said shell. Obvi ously the said recesses and lugs could beinterchanged as to the parts and be the same in effect. The said bodybhas a milledrim about its side adapted to be conveniently.

gripped by the hand to turn the plug, andwhen turnm g occurs (andassuming that the plug is in an inverted position to that shown in thedrawings) the said body is pressed upward into engagement with the saidlugs 4 and turned and thereby turning the screw shell in its socket, notshown. When the hand has turned as far as is comfortable the grip isreleased, the said body 6. dropshy gravity, and any twisting of thestrand that has occurred instantly rights itself. Then another grlp ismade with a" further turn of the plug and so on until the "plug 1sscrewed home into its socket andelectrical connection is completed. Of

course the instant the un-lift upon the body b isreleased it drops downand isfree to .rotate regardless of said shell 5 but elec tricalconnection remains through or between the said shell and ring 2 which inany case overlap sutliciently for this purpose. A term nal binding screw6 is shown as engaged in an ear on the band 2 as seen in Figs. 4 and 5.

It follows from bodv or head 2 is supported in a sliding relation withinlimits upon or about the said shell 5, and said shell is supported atits other end or edge by several associated parts comprising a stem orstandard 7 whichi's embedded in body I) and has a threaded hole throughits free right angled end adapt'd to in a porcelain disk d which-issupported within the edge of the said screw'shell.

plug first in its Stlllilr h connecting the foregoing that the has acentral bore occupied by the thimble 9.

I Gopiesof this patent may be obtained for The said shell may be engagedwith said disk in any suitable way, and the said disk The screw 8 has arelatively long cylindrical head slidably fitted in the inner portion ofsaid thimble and a body portion of smaller diameter slidable in the neckor contracted inner portion at of the thimble. 'The screwthrcaded andrelatively reduced extremity 10 of the said screw engages through thethreaded hole in the right angled portion of stem 7 and thus aneffective support is provided for the outer portion or end of said screwshell 5 while at the same time a conducting electrical connection isformed from the flanged out end 15 0t thimble 9 through the said stem orstandard 7 or to the binding screw 16 thereon.

The adaptation of the stem or standard 7 to slide within limits throughthe peculiar construction of screw 8 in thimble 9 provides that may betermed a flexible electrical connection with the said thimble from thebody I), or rather with the band 3 thereon, and the length of the saidbody portion of the screw measurably fixes the limit of movement, es-.pecially to open position, as in Fig. 1. Therefore, having the plug moreor less engaged in its socket, not shown, the head of body 7) can bemanipulated, and in a sense it acts like a wrench as it is raised orbrought into engaging relations with the screw shell to turn thesame,and in this movement the stem or standard 7 and screw 8 participate.

Fig. 6 shows a modification in this particularly that the screw 12 is astationary part in disk d and has a flanged contact head 15' I outsidesaid disk and a spool 14 is threaded on said screw outside said diskwhile the stem or standard 7 has a hole in its right angled portionengaged on said screw and slidable thereon within limits like the screw8 in spool 9, Fig. 3.

In the foregoing construction the body I) is freely rotatable in respectto the shell 5 in either direction when disengaged at the points 3 andl, but the overlapped engagement between said parts is close and in current-conducting condition and the binding screw 6 marks one of theterminal connections as above described. The other terminal carried bythe member I) is at 16 on the stem or standard 7, which presumably ismolded into said member in its manufacture. The flanged head 15' and thescrew serves to make electrical connections in the plug socket. However,these are details of inc-idental imp'ortance merely as the inventionresides essentially in the novelty which operatively separates the bodyI; from the screw shell 3 and in one position leaves said body free toturn in either direction independently of the said shell and in theother position interlocks therewith and becomes an instrument forturning the shell into and out of its socket. Any construction havingthis peculiarity and function is considered as within the spirit of thisinvention.

In Fig. if the body b be rotated the screw 8 fixed on stem 7 will rotatealso in thimble 9, and in Fig. 6 the stem 7 will be rotated about thespool 14.

What I claim is:

1. A plug for electric lamps comprising a screw shell of conductingmaterial and a non-conducting part having a ring about the same insliding relations with said shell, and said shell and ring provided withmeans constructed to mechanically interlock.

2. A plug for electric lamps having a screw threaded shell, a body ofnon-conducting material having a normal free rotation in respect tosaid'shell and a metallic band about the same in overlapping relationswlth said shell, and the said shell and band provided withinterlockingportions at their meeting edges. I

3. A plug for electric lamps having a screw-threaded metallic shelland'a non-conducting body adapted to be engaged and disengaged rotarilytherewith, and means supporting thevopposite end of said shellcomprising a non-conducting part and slidably related conducting meanscentrally of said several parts.

a. Aplug for electric lamps having a screw-threzided metallic shell anda non-conducting body having a contact band about its inner portion andsaid band and shell provided with means constructed to mechanicallyinterlock, the said body being normally disengaged and free to turnindependently of said shell.

A plug for electric lamps having ascrew-threaded shell and a bodyslidably and rotatably related thereto having a band about the same inoverlapping relations with said shell, a disk of non-conducting materialcarrying the opposite end of said shell and means supporting said diskcomprising a stem fixed in said body, a spool rotatably mounted in saidstem and a screw on which said spool is engaged and uniting said stemwith said disk.

In testimony whereof I afiix my signature in presence of two witnesses.

lVILLIAM C. TREGONIN'G.

, Witnesses:

F. O. MUssUN, L. H. STADE.

five cents each, by addressing the Commissioner of Patents,

Washington, D. G.

